Moses was born on the 7th of Adar of the year 2368 from creation (1393 BCE); accordingly, Adar 14 was the 8th day of his life and the day on which he was circumcised in accordance with the Divine command to Abraham.
The festival of Purim celebrates the salvation of the Jewish people from Haman's plot "to destroy, kill and annihilate all the Jews, young and old, infants and women, in a single day."
The events of Purim extended over a period of several years, culminating in the victory celebrations of Adar 14-15 of 356 BCE. Below is a timeline of the major events. For the detailed story, see the Book of Esther and The Story of Purim